Yeah it's pretty cool how they work. 

1. I have an old zbd account from '21 with a lnaddr of `k00b@zbd.gg`
2. applications go to `https://<domain>/.well-known/lnurlp/<name>` when they want to pay a lightning address
    - e.g. https://zbd.gg/.well-known/lnurlp/k00b (you can visit this in your browser)
3. from the response in (2), we take the `callback` field (another url) and then append arguments like the invoice amount
    - e.g. https://api.zebedee.io/v0/process-static-charges/8a26fded-2f64-4404-8af8-f0032b186de4?amount=1000 (you can visit this in your browser) which asks zbd to make a 10 sat bolt11 invoice
4. When visiting the url in (3), it has a`pr` response which is the bolt11 invoice that we pay

k00b

Stacker Saloon

saloon

ok thanks 🥺

I didn't even know ln-urls have full invoices and expiration times in the background before you explained it to me recently